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参数资料
| 型号： | LT3485EDD-0#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO10 |
| 封装： | 3 X 3 MM, PLASTIC, MO-229WEED-2, DFN-10 |
| 文件页数： | 3/20页 |
| 文件大小： | 339K |
| 代理商： | LT3485EDD-0#TR |
LT3485-0/LT3485-1/
LT3485-2/LT3485-3
11
34850123fb
Note that the absolute maximum rating of the SW pin is
not exceeded. Make sure to check the SW voltage wave-
form with VOUT near the target output voltage, as this is the
worst case condition for SW voltage. Figure 4 shows the
various limits on the SW voltage during switch turn off.
It is important not to minimize the leakage inductance to
a very low level. Although this would result in a very low
leakage spike on the SW pin, the parasitic capacitance of
the transformer would become large. This will adversely
affect the charge time of the photoflash circuit.
Linear Technology has worked with several leading mag-
netic component manufacturers to produce pre-designed
flyback transformers for use with the LT3485-0/LT3485-
1/LT3485-2/LT3485-3. Table 2 shows the details of sev-
eral of these transformers.
Capacitor Selection
For the input bypass capacitors, high quality X5R or X7R
types should be used. Make sure the voltage capability of
the part is adequate.
Output Diode Selection
The rectifying diode(s) should be low capacitance type
with sufficient reverse voltage and forward current rat-
ings. The peak reverse voltage that the diode(s) will see is
approximately:
VV
N V
PK R
OUT
IN
=+ (
)
APPLICATIO S I FOR ATIO
WU
U
Table 2. Pre-Designed Transformers – Typical Specifications Unless Otherwise Noted
TRANSFORMER
SIZE
LPRI
LPRI-LEAKAGE
RPRI
RSEC
FOR USE WITH
NAME
(W
× L × H) mm
(
H)
(nH)
N
(m
)()
VENDOR
LT3485-0/LT3485-2
SBL-5.6-1
5.6
× 8.5 × 4.0
10
200 Max
10.2
103
26
Kijima Musen
LT3485-1
SBL-5.6S-1
5.6
× 8.5 × 3.0
24
400 Max
10.2
305
55
Hong Kong Office
852-2489-8266 (ph)
kijimahk@netvigator.com (email)
LT3485-0
LDT565630T-001
5.8
× 5.8 × 3.0
6
200 Max
10.4
100 Max
10 Max
TDK
LT3485-1
LDT565630T-002
5.8
× 5.8 × 3.0
14.5
500 Max
10.2
240 Max 16.5 Max
Chicago Sales Office
LT3485-2
LDT565630T-003
5.8
× 5.8 × 3.0
10.5
550 Max
10.2
210 Max
14 Max
(847) 803-6100 (ph)
LT3485-3
LDT565630T-041
5.8
× 5.8 × 3.0
4.7
150 Max
10.4
90 Max
6.4 Max
www.components.tdk.com
LT3485-0/LT3485-1
T-15-089
6.4
× 7.7 × 4.0
12
400 Max
10.2
211 Max
27 Max
Tokyo Coil Engineering
LT3485-1
T-15-083
8.0
× 8.9 × 2.0
20
500 Max
10.2
675 Max
35 Max
Japan Office
LT3485-3
T-17-109A
6.5
×7.9 × 4.0
5.9
300 Max
10.2
78 Max 18.61 Max
0426-56-6262 (ph)
www.tokyo-coil.co.jp
Figure 4. New Transformer Design Check (Not to Scale)
Figure 3. LT3485 SW Voltage Waveform
IPRI
1A/DIV
VSW
10A/DIV
VIN = 5V
VOUT = 320V
100ns/DIV
3485 F03
2
VSW
3485 F04
0V
“A”
“B”
MUST BE
LESS THAN 40V
MUST BE
LESS THAN 50V
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3485EDD-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Photoflash Capacitor Chargers with Output Voltage Monitor and Integrated IGBT Drive |
| LT3485EDD-1#PBF | 功能描述:IC CHARGER PHOTOFLASH 10-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 标准包装:1 系列:- 应用:手持/移动设备 电流 - 电源:- 电源电压:3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-WFDFN 裸露焊盘 供应商设备封装:14-LLP-EP（4x4） 包装:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名称:LP3905SD-30DKR |
| LT3485EDD-1#TRPBF | 功能描述:IC CHARGER PHOTOFLASH 10-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 标准包装:1 系列:- 应用:手持/移动设备 电流 - 电源:- 电源电压:3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-WFDFN 裸露焊盘 供应商设备封装:14-LLP-EP（4x4） 包装:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名称:LP3905SD-30DKR |
| LT3485EDD-2 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Photoflash Capacitor Chargers with Output Voltage Monitor and Integrated IGBT Drive |
| LT3485EDD-2#PBF | 功能描述:IC CHARGER PHOTOFLASH 10-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 标准包装:1 系列:- 应用:手持/移动设备 电流 - 电源:- 电源电压:3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-WFDFN 裸露焊盘 供应商设备封装:14-LLP-EP（4x4） 包装:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名称:LP3905SD-30DKR |
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